Started as carnival slang, likely from the British dialectal term geck(“a fool, dupe, simpleton”) (1510s), apparently from Dutch gek or Low German geck, from an imitative verb found in North Sea Germanic and Scandinavian meaning "to croak, cackle," and also "to mock, cheat" (Dutch gekken, German gecken, Danish gække, Norwegian gakke, Swedish gäcka); The root still survives in the Dutch adjective noun gek(“crazy" or "crazy person”). Compare also Old Norsegikkr(“a pert, rude person; jester; fool”).

I challenge these geeks to show a little spirit and produce an 81 tier bonfire by Friday night. It would also be nice to see a few kegs and some spirit around their awaited creation each night. Until then I rest my case.

2007Kelly Boler, inmag.com:"Basically," says [Harry J.] Knowles [founder, 'Ain't It Cool News' website], "it's my job to stay on top of the latest and coolest in geek that's out there, specifically as it relates to the world of film."

(colloquial) To behave geekishly or in a socially awkward manner, especially when under the influence of drugs or other psycho-active substances, and exhibiting such marked characteristics as hyperactivity, repetitiveness, talkativeness, nervousness, irritability, or paranoia.